I have an old Non Pro SVT II, it has served me well throughout the years but recently it has not been working properly, it powers on and will play for a few minutes but then the sound cuts out. Im hoping that it just needs some new tubes but who knows. Has anyone else experienced this?
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Ampeg SVT II NP
- Thread starter mattmanbass
- Start date
Bypasses the possibly corroded jacks of the FX loop, but I doubt that's your problem since the amp works and then shuts down presumably when it gets hot.
Take it to a tech. You definitely shouldn't be poking around in there.
Take it to a tech. You definitely shouldn't be poking around in there.
take it to a good tech, might not be the power tubes that are bad. if you want to check this, you can plug your bass right into the amp in jack in the rear when it's doing the problem, if you get good sound then you're losing the signal in the preamp.
could be a bad preamp tube, or the previously mentioned preamp out/amp in jacks being corroded. mine also had a problem with the plug going from the preamp board to the power amp section. my tech redid some of the solder joints on the preamp board while he was in there. been reliable ever since...
could be a bad preamp tube, or the previously mentioned preamp out/amp in jacks being corroded. mine also had a problem with the plug going from the preamp board to the power amp section. my tech redid some of the solder joints on the preamp board while he was in there. been reliable ever since...
Ok guys thanks, I will take it to someone who knows what they are doing lol. I really hope its an easy fix and not messed up to badly, this is the best sounding amp ive ever owned, id be devastated if it is dead!
Totally agree with you. The biggest mistake I ever made was selling my SVT2 nonpro. I would walk over broken glass to get another one but they seldom come up down here.
It's probably a relatively simple fix (but still one that should be done by a tech.) The II nonpro is a godly amp.
I sure hope so, its funny, I agree its a godly amp, and when I bought it several years ago I got it because it was the only used bass amp that they had at my local guitar store, I really had no idea what it was other than I recognized the ampeg brand, I paid $600 for it, best money I ever spent lol
Anderbass! this is genius!
I've just joined the boomerang club (sold my SVT-II, then 12 years later got another) - and whaddya know? same issue i had that took a long time to track down before!
SO, would this mean the issue is in the preamp circuit? Likely i'll need help tracking that voodoo down!
Afaik, and I'm not an expert, if it works as usual with this in place, the jacks maybe corroded. You can leave a patch lead connecting them and yr good to go.
Someone who knows more will hopefully chime in
Your Poweramp in jack has a little Shunt (circled in the pic) that connects your preamp section to the poweramp section anytime your NOT using this jack to patch effects devices or whatever. It's pretty common for those little shunt conections to get tarnished, dirty or damaged where they will no longer pass the signal along to the poweramp.
So when you patch a guitar cord between your preamp out and power amp in jacks, that guitar cord is simply taking over and making the same connection that the malfunctioning Shunt normally would. Using one of those little short guitar pedal cords with angled jacks work great for this situation.
